* {
    margin: 0;
    padding: 0;
    text-decoration: none;
    list-style: none;
}

/* 左边导航栏 */
.feature {
    position: fixed;
    left: 0;
    top: 0;
    width: 250px;
    height: 100%;
    background-color: rgb(34, 45, 47);
}

.feature p {
    width: 250px;
    height: 60px;
    text-align: center;
    line-height: 60px;
    background-color: #027B72;
}

.avatar {
    width: 250px;
    height: 125px;
    /* background-color: aqua; */
}

/* 管理员头像 */
.avatar img {
    position: relative;
    margin-top: 15px;
    margin-left: 15px;
    width: 90px;
    height: 90px;
    border-radius: 50%;
    background-color: yellow;
    cursor: pointer;
}

.administrator-detail {
    position: relative;
    top: -75px;
    left: 110px;
    display: flex;
    flex-direction: column;
    width: 140px;
    height: 60px;
    line-height: 30px;
}

.administrator-detail a {
    margin-left: 10px;
    color: #fff;
}

.administrator-detail a:nth-child(1) {
    font-size: 20px;
}

/* 在线图标 */
.icon-yuandian {
    vertical-align: middle;
    font-size: 20px;
    color: rgb(57, 181, 115);
}

/* 功能大框 */
.menu-list {
    margin-top: 15px;
    height: 100%;
    font-size: 25px;
    background-color: rgb(34, 45, 47);
}

.menu-list ul li {
    line-height: 60px;
    margin-left: 52px;
    /* text-align: center; */
    color: #fff;
}

.menu-list ul li:hover>a {
    color: rgb(2, 123, 114);
}

.menu-list ul li a {
    display: block;
    width: 100%;
    height: 60px;
    color: #fff;
    text-decoration: none;
    /* background-color: #007fc8; */
}

.menu-list ul li.first-menu.active>a {
    color: rgb(171, 216, 213);
    vertical-align: middle;
}

.menu-list ul li.first-menu.active ul li.second-menu.current a {
    /* background-color: rgba(195, 224, 223, 0.4); */
    /* text-align: center; */
    font-size: 18px;
}

.menu-list ul li.first-menu ul li.second-menu a {
    font-size: 19px;
}


/* 导航-图标 */
.common {
    font-size: 20px;
    margin-right: 8px;

}

/* 右边内容 */
.right-nav {
    /* position: relative;
    /* top: -500px; */
    position: relative;
    left: 250px;
    /* left: 250px; */
    /*width: 1236px;*/
    /* height: 753px; */
    height: 100%;
    /*background-color: rgb(194, 211, 160);*/
    background: radial-gradient(lightskyblue,lightseagreen);
}

/* 顶部导航  */
.information {
    position: sticky;
    top: 0;
    display: flex;
    justify-content: flex-end;
    width: 100%;
    height: 60px;
    line-height: 60px;
    vertical-align: middle;
    font-size: 18px;
    z-index: 1;
    background-color: #009788;
}

.information a {
    display: block;
    text-align: center;
    width: 90px;
    height: 60px;
    color: #fff;
}

.information a:nth-child(1) {
    width: 110px;
    height: 140px;
}



.information a:hover {
    background-color: #1c8276;
}

/* 下拉菜单 */
.icon-jiantouxia {
    margin-left: 6px;
}

.icon-shezhi1 {
    /* margin-left: 25px; */
    /* margin-right: 15px; */
    font-size: 18px;
}

/* 超级用户下拉菜单 */
.list {
    max-height: 0px;
    transition: max-height 0.25s ease-out;
    overflow: hidden;
    /* background: #d5d5d5; */
}

.information-user:hover .list {
    max-height: 140px;
    transition: max-height 0.25s ease-in;
}

/* 中间部分 */
.center {
    /* position: relative; */
    margin-left: 25px;
    margin-top: 25px;
    width: 1180px;
    /* height: 650px; */
    height: 100%;
    background-color: #fff;
    /*background: radial-gradient(lightskyblue,lightseagreen);*/
    box-shadow: 5px 0 5px rgba(23, 23, 23, .3);
}

/* 顶部信息 */
.center .title p {
    width: 100%;
    height: 55px;
    font-size: 17px;
    line-height: 55px;
    margin-left: 10px;
    border-bottom: 1px solid rgba(176, 173, 173, .3);
    /* background-color: #009788; */
    /* 禁止用户点击 */
    user-select: none;
}

/* 图书馆里图标 */
.icon-tushu-books {
    font-size: 23px;
    vertical-align: middle;
    margin-left: 15px;
    margin-right: 5px;

}

/* 隐藏id */
.displayid {
    display: none;
}

/* 编辑表框 */
.message {
    width: 65%;
    height: 550px;
    /* margin-top: 1px; */
    margin-left: 190px;
    border-radius: 5px;
    background-color: rgba(255, 255, 255, .5);
    /* background-color: red; */
}

.message input[type="text"] {
    width: 250px;
    height: 35px;
    outline: none;
    outline-style: none;
    border: 0px;
    border: 1px solid rgba(164, 162, 162, .4);
    background-color: rgba(0, 0, 0, 0);
}

.message input[type="text"]:focus {
    background-color: rgba(211, 215, 213, 0.3);
}

.books {
    position: relative;
    top: 15px;
    width: 50%;
    height: 50px;
    line-height: 50px;
    margin-left: 255px;
    margin-bottom: 20px;
    /*background-color: #5584d5;*/
}

/* 添加-取消按钮 */
.admition {
    width: 370px;
    height: 35px;
    margin-top: 30px;
    margin-left: 225px;
    text-align: center;
    line-height: 35px;
    /* background-color: wheat; */
}

.admit-common {
    display: inline-block;
    width: 75px;
    height: 45px;
    outline: none;
    margin-left: 26px;
    line-height: 45px;
    outline-style: none;
    border: 0px;
    border: 1px solid rgba(164, 162, 162, .4);
    border-radius: 3px;
    background-color: rgba(3, 10, 204, 0);
    cursor: pointer;
}

/* 添加按钮 */
.add {
    color:black;
    background-color: rgba(178, 78, 33, .8);
}

.add:hover {
    background-color: rgb(178, 78, 33);
}

/* 取消按钮 */
.removal {
    color:black;
    margin-left: 170px;
    background-color: rgba(216, 215, 218, .6);
}

.removal:hover {
    background-color: rgb(216, 215, 218);
}

/* 添加成功弹框 */
.success-tip {
    display: none;
    position: absolute;
    top: 7px;
    left: 35%;
    width: 280px;
    height: 50px;
    text-align: center;
    line-height: 50px;
    color: rgb(5, 172, 5);
    background-color: rgb(214, 246, 198);
    border-radius: 5px;
    font-size: 17px;
    z-index: 1;
}

/* 添加失败弹框 */
.failure-tip {
    display: none;
    position: absolute;
    top: 7px;
    left: 35%;
    width: 280px;
    height: 50px;
    text-align: center;
    line-height: 50px;
    color: rgb(220, 11, 11);
    background-color: rgb(210, 211, 209);
    border-radius: 5px;
    user-select: none;
    font-size: 17px;
    z-index: 1;
}
